@Duggy
to me it looks like a lockout of some sort ... happened to my white cheese when i feed some bad bloom nutes..
the rest of my biotab girls have been smooth sailing.... even with just the normal single week 5 feed ... they should be lush green ...
my water went from clear non-smelling to smelling like rotten aquarium, maybe give the undertray a sniff
Hope u get it sorted because this is not what a biotab grow should/could look like
also i only feed the orgatrex + bactrex combo , no pk boost, but 5ml each week from week 5 on, instead of only a 20ml week 5 feed